export default {};
// 先有需求，再有描述
let arr: number[] = [1, 2, 3, 123721739];
let arr1: string[] = ['a', 'b', 'c'];
let arr2: (string | number)[] = ['zs', 20];

// 元组就是特殊的数组
let position: [number, number] = [116.231, 26.2312];
